"The Biggest Loser" winner Rachel Frederickson is speaking out after her victory on the weight-loss competition series sparked criticism over whether she took things too far.

The 24-year-old shed 155 pounds, going from a starting weight of 260 pounds down to 105 pounds to the season-15 title. Her big reveal on the show's finale prompted concern from viewers who thought her dramatic weight-loss was unhealthy.

"I'm extremely proud of the way I lost the weight," she told Us magazine, adding, "I did everything so naturally, and the athlete in me really came back."

But, she admitted in a separate interview with People magazine, "Maybe I was a little too enthusiastic in my training to get to the finale."

Frederickson said she maintained a 1,600-calorie daily diet and worked out six hours a day in the three months leading up to the finale. Producers also said she was carefully monitored throughout her seven-and-a-half months on the show, including in the days leading up to the final episode.